Set top box



FIG. 1 is a front right side perspective view of a set top box showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines depict portions of the set top box that form no part of the claimed design. 

CLAIM The ornamental design for a set top box, as shown and described. 